It's a sort of sensation that Gen was very familiar with - feeling unnerved, disturbed, and worried what this person might do - but not letting on. Tsukasa's clear aggression and willingness to kill anyone who didn't fit his image of a perfect world. Dr. Xeno's clear megalomania. Although. The magic angle was new.

And 'dark arts' made him think he'd ended up in a fantasy book, but. There was magic from many people on this train, he essentially had.

His expression shifted, into something sly and crafty - as if Xue unexpectedly caught his interest. "Fierce corpses? I'll need a little more context, my friend - my home lacks any sort of magic, dark or otherwise. It sounds as if you've made a bit of a science of it, if you were developing new uses."